CO2-rich thermomineral groundwater in the Betic Cordilleras, southeastern Spain: Genesis and tectonic implications |
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| Authors: | J C Cerón M Martín-Vallejo L García-Rossell |
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| Institution: | (1) Department of Geology, University of Huelva, 21819 Palos de la Frontera, Huelva, Spain Fax: +34-959-536293 e-mail: ceron@uhu.es, ES;(2) Andaluz Institute of Earth Sciences, Department of Geodynamics, University of Granada, 18071 Granada, Spain, ES |
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| Abstract: | The CO2-rich thermal groundwater in the Betic Cordilleras in Spain has been studied with regard to the geological and hydrogeological
setting, physical and chemical characteristics, and 13C-isotope content. The study area is about 60 km northeast of Almería city, in southeastern Spain. The thermomineral waters
are plentiful and are related to regional geothermal anomalies. Temperatures of 20 −41°C, high bicarbonate concentrations
(183–1824 mg/L), and high amounts of PCO2 (<1.1 bar) characterize the groundwater. CO2 spatial variations are related to proximity to the Carboneras, Palomares, and Guadalentín fault systems, which may be the
surface representation of the zone of crustal thinning and magmatism. δ
13C values probably indicate a deep source for the CO2, either the mantle or perhaps carbonate rocks in the metamorphic substratum. The high amount of CO2 in the groundwater causes problems in wells and severely restricts water usage. The hydrothermal features of this area are
probably related to neotectonic activity.
Received, September 1998/Revised, June 1999, September 1999/Accepted, December 1999 |
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| Keywords: | hydrochemistry thermal conditions ?stable isotopes Spain carbon dioxide |
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